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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f533c72c95c0c6e40de97f534895cee0911d5bcebf866d5b7daf9183bf5dd8' 
  AND token = '+Z+U+KHteUKSevg3rAyBZ9FnGOuHD3own/aT+XiTb5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}